I see http://www.imagemagick.org/script/command-line-options.php#density is currently set at 600 dpi. https://gerrit.wikimedia.org/r/#/c/138149/7/lib/index.js,cm
This seems excessive, makes it very easy to reach tens or hundreds MB in PDF from few big pages. For a book, 300 dpi is generally plenty; scans for instance rarely go over 400 dpi.
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See Also:
http://web.archive.org/web/20110722071118/http://code.pediapress.com/wiki/ticket/463